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Trailer Lights > Tail Lights > Turn, Side Marker, Side Reflector > Non-Submersible Lights > 7 Inch Diameter > Incandescent Light > Amber > Round > Surface Mount > Optronics

7" Round Transit Turn Signal Light - Amber

Optronics Trailer Lights

Code:   ST90AB



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Optronics Trailer Lights - ST90AB

7-1/8" Diam x 2-3/16" D; Weather-tight seal w/gasket; replaceable lens and bulb; surface mount on 6-1/4" centers; 2-wire; 1-bulb incandescent

7" Round Transit Turn Signal Light - Amber

This is a round transit light used as a turn signal light. This amber light is 7-1/8" in diameter by 2-3/16" deep. The light includes a gasket for a weathertight seal against the elements. The light features a replaceable, screw-down lens and easy-to-replace bulb. This light surface mounts through holes placed at the four "corners" along the edge of the light. The holes are spaced 6-1/4" across the light. The wiring design contains the lead wires for power and is grounded through the mounting hardware.

  • Amber, round light functions as turn signal light
  • Gasket is included to create weathertight seal
  • Replaceable lens and bulb
  • Wiring design contains lead wires and grounds through mounting hardware
  • Surface mounts with four holes at 6-1/4" apart across center of light
  • Dimensions: 7-1/8" Diam x 2-3/16" D

Manufacturer Specifications

Amber rear turn signal for surface mount. Gasket for water tight seal provided. Features screw on, replaceable lens and easy to change replaceable bulb. Contains both lead and ground wire for mounting to all surfaces.

dimensions of light

ST-90AB 7" Round Transit Light - Amber by Optronics, Inc.


Ask the Experts about this Optronics Trailer Lights
Expert Answers about 7" Round Transit Turn Signal Light - Amber - ST90ABDo you have a question about this Trailer Lights?

  • 2001 Chevy Silverado 3500 Tail Lights Not Working and Brake Signal on 7-Way Not Working
  • From what I have been able to find, the 2001 Chevy Silverado 3500 had what is called a 3-wire system. This means the turn signals are separate from the brake lights. If the lights you are using are designed for a 2 wire system then it they will not function properly. There are 2 possible options. First, you can get lights that do have separate turn signal functions. Second you can use a special converter on the truck wiring to take the separate signals and combine them to a 2-wire system...
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  • Is there a Signal Contact Version of the Optronics Dual Face Trailer Parking/Turn Signal Post Mount
  • According to my contacts at Optronics they do not offer a single wire system. The wires on this particular light are as follows: Red wire - parking light Black wire - turn signal Furthermore this light grounds through the mounting bolt to the trailer. I have checked our and we do have the Optronics 7 Inch Round Transit Turn signal # ST900AB that only has one wire. This light serves as a turn signal only and is a single sided light not double sided like the product that you...
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Expert Answers about 7" Round Transit Turn Signal Light - Amber - ST90ABDo you have a question about this Trailer Lights?

Info for this part was:

Photos by:
Theodore B

Updated by:
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